Mental and Substance Use Disorders Prevalence Study: Background and Methods

ObjectiveThe Mental and Substance Use Disorders Prevalence Study (MDPS) builds upon previous epidemiologic studies to provide estimates of prevalence and treatment rates of mental and substance use disorders among adults aged 18-65 in the U.S. The study background and methods are described.MethodThe MDPS employed novel techniques such as the inclusion of household, prison, homeless and state psychiatric hospital populations, a semi-structured clinical interview administered by trained clinical interviewers to assess disorders, the assessment of both past year and lifetime schizophrenia spectrum disorder (SSD) using full Diagnostic and Statistical Manual 5 criteria, as well as other mental and substance use disorders, and video-based interviewing. Population specific and combined sample weights were developed to estimate nationally representative prevalence and treatment rates.ResultsData collection was conducted between October 2020 and October 2022 resulting in 5679 clinical interviews. The statistical weighting and analytic plan are described. Weighted response rates and reasons for non-response are provided for each study population.ConclusionsThe MDPS successfully developed and employed novel techniques to estimate the prevalence and treatment rates of mental and substance use disorders in both household and non-household populations, including some of the most impairing disorders such as SSD.